Hydrochloric Acid → 4-(3-ethoxy-4-hydroxy-5-nitrophenyl)-5-(3-methoxyphenyl)-6-phenyl-3,4-dihydropyrimidin-2(1H)-one

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To a solution of 2-(3-methoxyphenyl)-1-phenylethanone (400 mg, 1.77 mmol), 3-ethoxy-4-hydroxy-5-nitrobenzaldehyde (374 mg, 1.77 mmol) and urea (244 mg, 5.31 mmol) in 20 mL of ethanol was added 0.2 mL of concentrated HCl, then the mixture was stirred at reflux for 4 days. After the solvent was removed under reduced pressure, the residue was purified by HPLC (35-65% acetonitrile+0.1% trifluoroacetic acid in water, over 15 min.) and then purified by thin layer chromatography (PE:EtOAc=1:2) further to give Compound 23 (20 mg, yield 2.5%). 1H NMR (CD3OD 400 MHz): δ 7.43 (s, 1H), 7.17 (s, 5H), 6.86-6.82 (m, 2H), 6.48 (d, J=6.4 Hz, 1H), 6.40 (d, J=8.0 Hz, 1H), 6.30 (s, 1H), 5.03 (s, 1H), 3.91-3.89 (m, 2H), 3.37 (s, 3H), 1.30 (t, J=7.2 Hz, 3H); MS (ESI): m/z 462.3 [M+1]+.

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